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Higgs Searches at the Tevatron

Higgs Searches at the Tevatron. Hal Evans Columbia U. Outline: Optimism Disappointment (w/ some rays of sunshine) Anticipation no, we haven’t found it….. yet!. Max Chertok Mark Kruse Juan Valls. Regina Demina Andr é Turcot Weiming Yao. Credit where Credit is Due….

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Higgs Searches at the Tevatron

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  1. Higgs Searches at the Tevatron Hal Evans Columbia U. Outline: Optimism Disappointment (w/ some rays of sunshine) Anticipation no, we haven’t found it…..yet! La Thuile: 2-Mar-00

  2. Max Chertok Mark Kruse Juan Valls Regina Demina André Turcot Weiming Yao Credit where Credit is Due… I got lots of help from… And of course, Big Thanks to The Conference Organizers La Thuile: 2-Mar-00

  3. MH = v2 is a free param in the SM Limited Region for EWSB to work MH too large   blows up MH too small  2nd min at large  SM valid to MP for MH ~ 130-180 GeV New Physics (has to be there!) SM violates “Naturalness”  MSSM? 5 Physical Scalars: h,H,A,H Higgs Sector governed by: MA, tan  tree level All (esp. Xt) 1-loop Searches in a multi-parameter space Experiment Says… MH > 102.6 GeV LEP Higgs WG P.McNamara: Sep-7-99 LEPC (s  196 GeV) MH < 215 GeV LEP EW-WG 99 CERN-EP/2000-016 (summer 99) LEP EW-WG: CERN EP 2000-016 K.Riesselmann: DESY 97-222 Theoretical Optimism La Thuile: 2-Mar-00

  4. SM Higgs at the Tevatron Representative Cross-Sections (s = 2.0 TeV) Moral: Use WH / ZH Production La Thuile: 2-Mar-00

  5. MSSM Higgs Production CP-Even (h,H) Tan  = 3 Tan  = 30 CP-Odd (A) La Thuile: 2-Mar-00

  6. SM Final States • Low Mass (MH<130GeV) Hbb • ??? • Hi Mass (MH>130GeV) HWW/ZZ • Here ggH VV possible La Thuile: 2-Mar-00

  7. MSSM h,H,A Final States • Neutral Higgs (h,H,A) • Enhanced coupling to b,  for large tan • Similar to SM searches • More reliance on hadronic Final States MSSM: h BRs tan  = 1.5 tan  = 5.0 tan  = 20 tan  = 50 MSSM: A BRs La Thuile: 2-Mar-00

  8. MSSM H Final States • Charged Higgs (t Hb) • mH+ < mt – mb • tan small  Wbb, cs • tan large  • H   • tt Disappearance Search • t  H+b missed in t  W+b La Thuile: 2-Mar-00

  9. The Glorious Run I Legacy (?) All Results: MH = 100 GeV * = Preliminary La Thuile: 2-Mar-00

  10. Run I SM Higgs Picture CDF DØ La Thuile: 2-Mar-00

  11. CDF Run I bb Analysis • In MSSM (bb)  tan2 •  = h,H,A • At large tan  (>20) • mh ~ mA (mA < 125 GeV) • mH ~ mA (mA > 125 GeV) • Two Scenarios • Min stop Mixing: mh(max)=115GeV • Max stop Mixing: mh(max)=130GeV • CDF Searches for bbbb • 4-Jet + ET>125GeV Trigger • 4 Jets ET cuts m dependent •  3 b-tag SECVTX • bb > 1.9 • Mbb Thanks to Juan Valls La Thuile: 2-Mar-00

  12. bbbb Analysis 2b-tag Sample 3b-tag Sample La Thuile: 2-Mar-00

  13. bbbb Results La Thuile: 2-Mar-00

  14. Once More into the Breach ! CDF – Run II DØ – Run II La Thuile: 2-Mar-00

  15. Wonderful New Detectors ! La Thuile: 2-Mar-00

  16. Impact on Higgs Searches Data ! Run I: Zbb La Thuile: 2-Mar-00

  17. How We Win with b’s Run II bbjj Study S/B vs Mbb/ Mbb S/B vs (b-tag) La Thuile: 2-Mar-00

  18. Predictions based on average CDF & DØ SHW Simulation Widely Used Caveats Trigger Eff ‘s 100% for leptonic Final States Crude Systematics / Fakes A Great Start !!! Run II Prophecies Read the “Report of the Higgs Working Group” ! http://fnth37.fnal.gov/higgs.html La Thuile: 2-Mar-00

  19. Run II SM Higgs Channels • Standard SHW Res’s • Mbb/ Mbb = 10% • New NN Analysis • Bhat, Gilmartin, Prosper • hep-ph/0001152 La Thuile: 2-Mar-00

  20. Run II SM Higgs Sensitivities LEP2: MH > 102.6 GeV (P.McNamara - Sep-7-99 LEPC) http://fnth37.fnal.gov/higgs.html La Thuile: 2-Mar-00

  21. MSSM Neutral Higgs Sensitivities 5 fb-1 3 5 10 fb-1 20 fb-1 30 fb-1 Max stop Mixing MS = 1 TeV &  > 0 50 95% CL LEP2: Mh > 84.3 GeV MA > 84.5 GeV tan 0.8-1.9 excl (P.McNamara - Sep-7-99 LEPC) 10 tan A= -m = 1.5 TeV 1 100 400 MA La Thuile: 2-Mar-00

  22. MSSM Charged Higgs Sensitivity LEP2: M(H+) > 77 GeV (P.McNamara - Sep-7-99 LEPC) La Thuile: 2-Mar-00

  23. Run I No sensitivity to SM Higgs Interesting limits in some scenarios (large tan …) Valuable Experience Run II Gains  L dt: 20 – 300(?) B-tag 3.5 (double b-tag) Mbb Res 30% gain X-Sect 1.17 Two detectors w/ good sensitivity Summary La Thuile: 2-Mar-00

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